I started spotting when I was 7 weeks pregnant, and they ran all of my labs (progesterone and hcg). My Hcg was through the roof (something like 50,000), but my progesterone was only 7.4. I was put on a pretty aggressive dosage of prometrium (400mg twice daily...the usual dosage is 100-200mg once a day). At 13 weeks, I stopped prometrium for 3 days and had my level re-checked, and it was only 20.5, and they wanted it to be around 35. So, I stopped taking prometrium at about 22 weeks, and all is looking fine so far. I'm currently 26 weeks 5 days, and everything looks good. I was told that I would probably miscarry with a progesterone level of 7.4, but I didn't (Thank God!) Having suffered a miscarriage last year, I don't think I could have handled it. I'm glad your doctors are keeping an eye on it, and just take it one day at a time. I'll be thinking about you and I wish you the best!
Tracy